Before the start of play Yorkshire and Nottinghamshire were separated by just six points at the top of the table with serious aspirations of capturing the title this season.
Yorkshire had a tough Roses clash against Lancashire at Old Trafford but has the better of a day one as they captured three bowling points.
Nottinghamshire, meanwhile, took on Durham at Chester-le-street but it was the home side who held the advantage after day one despite Nottinghamshire also capturing three bonus points.
Neither top-of-the-table Yorkshire or second placed Nottinghamshire were expecting easy games as both Durham and Lancashire were battling against relegation from division one.
Lancashire made worst possible start
After winning the toss and deciding to bat Lancashire made the worst possible start as they slumped to 0-2 in the first over as Ryan Sidebottom dismissed both Paul Horton and Usman Khawaja. Lancashire rallied as Luis Reece (53) and Ashwell Prince (53) added 96 for the third wicket but Yorkshire continued to take wickets throughout the day.
Lancashire's Tom Smith (57) also hit a half-century but nobody could go on and hit a score of note as Yorkshire's bowlers finally dismissed their fierce rivals for 278.
Veteran Ryan Sidebottom (3-42), Jack Brooks (3-64) and Adil Rashid (3-77) were the pick of the bowlers for the visitors.
In reply Yorkshire reached the close of play on 61-0 and will hope to build on their advantage during day two.
Durban v Nottinghamshire
Meanwhile the Durham and Nottinghamshire clash saw 14 wickets fall on day one as Durham held the advantage going into day two.
After winning the toss and deciding to bat Durham posted 253 in their first innings thanks to Mark Stoneman (55) and Michael Richardson (73). Ajmal Shahzad (3-71) was the pick of the Notts bowlers.
Whilst Notts will have been happy with their bowling display they will be very disappointed with their batting reply. They will resume day two on 66-4 after John Hastings (2-15) had reduced the visitors to 3-2 at one point.
Day two will be crucial for Notts as they look to fight-back if they are to keep alive their title hopes this season.
Each session of each of these games is crucial as just two more game remain, three for Durham, after this round of fixtures. The County Championship is heading for a thrilling finale at both ends of the table.